JP7089985B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper having a pair of inseam telescopic portions extending in the anterior-posterior direction in the inseam region.

Disposable diapers having a pair of inseam telescopic portions extending in the inseam region in the anterior-posterior direction are known (see, for example, Patent Document 1). The inseam stretch is located in the area that overlaps the absorption core. By contracting the inseam elastic part, the absorption core in the inseam area is pulled up toward the body.

Further, the absorption core of Patent Document 1 is formed with a pair of groove-shaped portions extending in the front-rear direction. The groove-shaped portion serves as a deformation base point of the absorption core. In the disposable diaper configured in this way, when the disposable diaper is worn, the absorption core is deformed from the groove-shaped portion as a base point, and the absorption core overlapping the inseam expansion / contraction portion is pulled up toward the body.

Japanese Unexamined Patent Publication No. 2018-473

However, the above-mentioned disposable diapers have the following problems.
Disposable diapers are worn from the wearer's buttocks to the abdomen. The shape of the body on which the disposable diaper is worn is the narrowest in the crotch and bulges outward in the width direction from the crotch to the buttocks. In the disposable diaper of Patent Document 1, the absorption core pulled up by the contraction of the inseam elastic portion is pulled up with respect to the crotch of the wearer. However, since the inseam expansion and contraction portion extends in parallel in the front-rear direction from the crotch to the buttocks, the absorption core is pulled up to the buttocks in the same manner as the crotch. Therefore, if the deformation of the absorbent core that fits to the crotch of the wearer continues in the rear waist circumference area, the disposable diaper may not fit to the buttocks, and leakage may occur.

Therefore, a disposable diaper that can secure the fit to the crotch of the body and the fit to the buttocks and suppress leakage is desired.

The disposable diaper according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, an anterior girth area, a rear girth area, an inseam area arranged between the anterior girth area and the rear girth area, and at least the inseam. The absorption core is provided with an absorption core arranged in a region and a pair of inseam expansion / contraction portions arranged on both outer sides of the center of the absorption core in the width direction and extending in the front-rear direction. A disposable diaper having a narrow portion whose length in the width direction is shorter than the maximum width, and at least a part of the inseam telescopic portion is inside the narrow portion in the width direction with respect to the outer edge of the absorption core. The rear end edge of the inseam telescopic portion is arranged on the front side of the rear end edge of the narrow portion.

It is a top view seen from the skin surface side of the disposable diaper which concerns on embodiment. It is a top view of the absorption core which concerns on embodiment. It is a schematic cross-sectional view along the AA cross section of the disposable diaper shown in FIG. It is a schematic cross-sectional view along the BB cross section of the disposable diaper shown in FIG. It is a schematic cross-sectional view along the CC cross section of the disposable diaper shown in FIG. It is a figure which schematically showed the wearing state in the AA cross section of a disposable diaper. It is a figure which showed schematically the wearing state of the disposable diaper which concerns on embodiment. It is a figure for demonstrating the deformation mode of the absorption core at the time of wearing. It is a figure for demonstrating the deformation mode of the absorber in the BB cross section of a disposable diaper.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the accompanying drawings.
The disposable diaper according to one embodiment includes an anterior-posterior direction and a width direction orthogonal to each other, an anterior girth area, a rear girth area, an inseam area arranged between the anterior girth area and the rear girth area, and at least the inseam. The absorption core is provided with an absorption core arranged in a region and a pair of inseam expansion / contraction portions arranged on both outer sides of the center of the absorption core in the width direction and extending in the front-rear direction. A disposable diaper having a narrow portion whose length in the width direction is shorter than the maximum width, and at least a part of the inseam telescopic portion is inside the narrow portion in the width direction with respect to the outer edge of the absorption core. The rear end edge of the inseam telescopic portion is arranged on the front side of the rear end edge of the narrow portion.

According to this aspect, the absorption core in the inseam region is pulled up toward the body by the contraction of the inseam expansion / contraction portion. A pair of inseam elastic parts are located on both outer sides of the center in the width direction, and the part overlapping the inseam elastic part is pulled up by the contraction of the inseam elastic part, and the area sandwiched by the inseam elastic part is along the body. It is pulled up while maintaining a flat and flat shape. The pair of inseam stretches are located inside the outer edge of the absorption core in the width direction, and the area between the pair of inseam stretches is pulled toward the body with respect to the region outside the width of the inseam stretch. Be done. Therefore, the fit to the crotch of the body can be ensured.

Further, when the area between the pair of inseam telescopic portions is pulled up toward the body, the narrow portion is pulled inward in the width direction in the region where the narrow portion and the inseam elastic portion overlap in the width direction, and the rear end of the inseam elastic portion is pulled. A polygonal line connecting the edge and the trailing edge of the narrow portion is formed. The deformation caused by the pair of inseam stretchable portions is guided to the side edges of the absorption core along these polygonal lines, and the deformation caused by the inseam stretchable portions can be suppressed from being transmitted to the rear waist circumference region. The fit to the buttocks can be ensured and the back leakage can be suppressed. In addition, by forming a polygonal line connecting the rear end edge of the inseam expansion and contraction portion and the rear end edge of the narrow portion, deformation that shortens the distance of the polygonal line is suppressed, and the rear end edge of the narrow portion is formed. Opposes the force moving inward in the width direction. Therefore, it is difficult for the rear end edge of the narrow portion to move inward in the width direction, and the width of the absorption core in the rear waist circumference region can be secured. Therefore, the absorption core can cover the buttocks in a wide area and prevent leakage.

According to a preferred embodiment, the front end edge of the inseam telescopic portion may be arranged posterior to the front end edge of the narrow portion.

According to this aspect, when the region between the pair of inseam stretchable portions is deformed in a convex shape, a polygonal line connecting the front end edge of the inseam stretchable portion and the front end edge of the narrow portion is also formed. It is possible to suppress the deformation due to the inseam expansion and contraction part from being transmitted to the front waist circumference area. The fit to the abdomen can be ensured and the front leakage can be suppressed. In addition, the polygonal line connecting the front end edge of the inseam expansion and contraction part and the front end edge of the narrow part face each other against the force that the front end edge of the narrow part moves inward in the width direction, and the width of the absorption core in the front waist circumference area is secured. can. Therefore, the abdomen can be covered with a large area by the absorption core, and leakage can be suppressed.

According to a preferred embodiment, the distance between the inseam stretchable portion and the outer edge of the absorption core may be 1/4 or more of the length between the outer edges of the absorption core.

According to this aspect, when the inseam stretchable portion is deformed convexly toward the body as a base point, the region outside the inseam stretchable portion in the width direction becomes a region supporting the convex deformation. Since the region outside the inseam expansion / contraction portion in the width direction is 1/4 or more of the entire width direction of the absorption core, the convex deformation is stably supported and the convex shape can be easily maintained. Further, since the rigidity of the region outside in the width direction is higher than that of the inseam expansion / contraction portion, the narrow portion of the absorption core is not deformed too much in a convex shape, and the area covered by the absorption core can be secured. Leakage can be further suppressed by covering the body with a large area by the absorption core.

According to a preferred embodiment, the absorption core has a pair of side sheets arranged on the skin surface side of the absorption core and covering the outer side portion of the absorption core, and the side sheets stand up due to the contraction of the leakage-proof elastic member. A pair of leak-proof gathers having a base point portion that serves as an upright fulcrum of the contraction portion are formed outside the portion and the contraction portion in the width direction, and the distance between the apex of the contraction portion and the base point portion in the width direction. May be longer than the widthwise distance between the outer edge of the absorption core and the inseam stretchable portion in the narrow portion.

According to this aspect, the leak-proof gather stands on the wearer side with the contracted portion as the apex due to the contraction of the leak-proof elastic member. The maximum height of the leak-proof gather when standing is the distance between the apex of the contracted portion and the base point portion in the width direction. Further, the maximum height of the convex deformation in the region where the narrow portion is provided is the distance between the outer edge of the narrow portion of the absorption core and the inseam expansion / contraction portion. Since the distance between the apex of the contraction part and the base point part is longer than the distance between the outer edge of the narrow part of the absorption core and the inseam expansion / contraction part, the height of the leakage-proof gather is higher than the height of the convex deformation. , Side leakage can be suppressed by leak-proof gathers.

According to a preferred embodiment, the inseam telescopic portion is arranged on one side of the absorption core with respect to the widthwise center and on the other side of the absorption core with respect to the widthwise center. It has a second inseam telescopic portion, and the first inseam telescopic portion and the second inseam telescopic portion each have a plurality of elastic members arranged at intervals in the width direction. The distance between the elastic members of the one inseam expansion and contraction portion and the distance between the elastic members of the second inseam expansion and contraction portion may be three times or less the thickness of the absorption core.

According to this aspect, since the first inseam expansion / contraction portion and the second inseam expansion / contraction portion each have a plurality of elastic members, the force for pulling up the absorption core becomes stronger, and it becomes easier to maintain the convex shape of the absorption core. Further, if the distance between the elastic members is more than three times the thickness of the absorption core, each elastic member may independently pull up the absorption core, and the elastic members may be integrated to pull up the absorption core. Since the distance between the elastic members is 3 times or less of the thickness of the absorption core, the plurality of elastic members of the first inseam expansion and contraction portion are integrated to pull up the absorption core, and the plurality of elastic members of the second inseam expansion and contraction portion are formed. The absorption core can be pulled up as a unit. Therefore, it becomes easier to form the convex shape of the absorption core.

According to a preferred embodiment, the absorption core in the inseam region is provided with a high-rigidity portion having a higher rigidity than the surrounding region between the pair of inseam expansion / contraction portions, and the high-rigidity portion is provided with the absorption portion. It may straddle the center of the core in the width direction.

According to this aspect, the rigidity is increased by the high rigidity portion, and the absorption core tends to have a surface shape along the body. The area between the pair of inseam stretchable portions is not deformed too much in a convex shape, and the area covering the body can be secured by the absorption core. In addition, since a high-rigidity portion is provided across the center of the absorption core in the width direction, the absorption core is placed along the excretion port of the body to improve the ability to draw in body fluids and suppress leakage. can.

According to a preferred embodiment, the waist-retracting portion has a waist-retracting portion that expands and contracts at least in the width direction in the rear waist circumference region, and the waist-retracting portion is located behind the narrow portion and the inseam-retracting portion. It may be arranged in a region overlapping the absorption core on the outer side in the width direction.

According to this aspect, the rear end edge of the narrow portion is reached by a polygonal line extending from the rear end edge of the inseam expansion / contraction portion, as described above. The polygonal line faces the force at which the trailing edge of the narrow portion moves inward in the width direction, and the trailing edge of the narrow portion is difficult to move inward in the width direction.
The length of the absorption core in the region overlapping the waist-retracting portion becomes shorter in the width direction due to the contraction of the waist-retracting portion. At this time, the region on the rear side of the narrow portion and on the outer side in the width direction from the inseam expansion / contraction portion is likely to be deformed inward in the width direction with the rear end edge of the narrow portion as the base point due to the contraction of the waist circumference expansion / contraction portion. At this time, the trailing edge of the narrow portion serves as a deformation base point and is difficult to move inward in the width direction. The rear end edge of the narrow part located on the rear side of the inseam expansion and contraction part becomes more difficult to move inside in the width direction, it is easier to secure the length in the width direction of the absorption core in the rear waist circumference area, and the back leakage is suppressed. can.

According to a preferred embodiment, the waist-surrounding stretchable portion has a first region and a second region having a higher elongation rate in the width direction than the first region, and the rear end of the inseam stretchable portion. The first region may be arranged on the first extension line extending from the edge to the rear side.

According to this aspect, since the first region is provided on the first extension line extending rearward from the rear end edge of the inseam expansion / contraction portion, the region deformed convexly by the contraction of the inseam expansion / contraction portion is the waist circumference. It is difficult to shrink in the width direction due to the shrinkage of the stretchable part, and it is easy to maintain a convex deformed state.

According to a preferred embodiment, the second region may be arranged on the second extension line extending rearward from the region outside the inseam expansion / contraction portion in the width direction.

According to this aspect, since the second region is provided on the second extension line, the region outside the width direction of the inseam expansion / contraction portion of the absorption core is the width direction with respect to the rear end edge of the narrow portion. It becomes easier to deform on the inside. The rear end edge of the narrow part located on the rear side of the inseam expansion and contraction part becomes more difficult to move inside in the width direction, it is easier to secure the length in the width direction of the absorption core in the rear waist circumference area, and the back leakage is suppressed. can.

According to a preferred embodiment, a fastening tape arranged in the rear waist area and having an engaging portion engaging with the front waist area, and expanding and contracting in the front-rear direction outside the absorption core in the width direction. The leg circumference expansion / contraction portion may be arranged on a first virtual line that includes a leg circumference expansion / contraction portion and connects the front end edge of the inner edge of the engagement portion and the rear end edge of the inseam extension / contraction portion.

According to this aspect, the first virtual line connecting the front end edge of the inner edge of the engaging portion and the rear end edge of the inseam telescopic portion is pulled outward in the width direction when the fastening tape is pulled during mounting. The force that is applied acts. The rear end edge of the inseam telescopic part is pulled outward in the width direction by the operation at the time of wearing, and the absorption core deformed convexly toward the body by the inseam telescopic part is also pulled outward in the width direction. Therefore, it is easy to prevent the convex deformation of the absorption core from falling inward in the width direction and to maintain the convex deformation state. Further, the leg circumference expansion / contraction portion is arranged on the first virtual line, and the leg circumference expansion / contraction portion can also be pulled up at the time of mounting. Therefore, the fit to the excretion opening of the crotch and the fit to the leg circumference can be improved, and leakage can be further suppressed.

According to a preferred embodiment, the absorption core which has a fastening tape which is arranged in the rear waist circumference area and has an engaging portion engaged with the front waist circumference region, and which is behind the inseam expansion / contraction portion, has a fastening tape. A pair of deformation base points extending toward the rear side toward the outside in the width direction and arranged at intervals in the width direction are provided, and the deformation base point portion is the inseam expansion / contraction portion. It may be arranged inside the second virtual line connecting the trailing edge and the trailing edge of the narrow portion in the width direction.

According to this aspect, the second virtual line connecting the rear end edge of the inseam telescopic portion and the rear end edge of the narrow portion is a polygonal line facing the force of the rear end edge of the narrow portion moving inward in the width direction. , The area sandwiched by the polygonal line is arranged so as to cover the body. The rear side of the inseam expansion / contraction portion in the region is deformed by the deformation base point portion. The deformation base point portion extends outward in the width direction toward the rear side, and the absorption core is formed with a deformation base point extending inward in the width direction from the rear waist circumference area toward the inseam area.
When the buttocks are placed on the back waist area to wear a tape-type disposable diaper and the diaper is pulled toward the inseam area, the absorption core extends inward in the width direction from the rear waist area toward the inseam area. Transformed by. As a result, the absorption core can be deformed so that the length in the width direction becomes shorter toward the inseam region side. The absorption core in the inseam region is deformed convexly toward the body due to the contraction of the pair of inseam expansion and contraction portions. Therefore, the absorption core in the inseam area is arranged along the body side. Therefore, the absorbent core can be appropriately stored in the crotch of the wearer. The absorbent core can be compactly stored in the gap between the wearer's feet while covering the wearer's buttocks with a large area. The absorbent core fits from the buttocks to the crotch of the wearer, further suppressing leakage.

According to a preferred embodiment, the angle of the second virtual line with respect to the width direction may be smaller than the angle of the deformation base point portion with respect to the width direction.

According to this aspect, since the angle of the second virtual line with respect to the width direction is small, the movement of the trailing end edge of the narrow portion inward in the width direction can be further suppressed, and the width of the absorption core in the rear waist circumference region is further secured. can. Further, since the angle of the deformation base point portion with respect to the width direction is relatively large, the region sandwiched by the second virtual line can be partially deformed and the body can be covered with the region outside the deformation base point portion in the width direction. .. Therefore, the absorption core can cover the buttocks in a wide area and leakage can be suppressed.

(2) Overall Outline of Disposable Diaper The disposable diaper according to the embodiment will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be a portion where the relationship and ratio of the dimensions of the drawings are different from each other.

The disposable diaper may be a tape-type disposable diaper or a pants-type disposable diaper. FIG. 1 is a plan view of the disposable diaper 10 according to the present embodiment as viewed from the skin surface side, and FIG. 2 is a plan view of the absorption core according to the embodiment as viewed from the skin surface side. The plan views shown in FIGS. 1 and 2 show a disposable diaper in an extended state. FIG. 3 is a schematic cross-sectional view taken along the AA cross section of the disposable diaper shown in FIG. FIG. 4 is a schematic cross-sectional view taken along the BB cross section of the disposable diaper shown in FIG. FIG. 5 is a schematic cross-sectional view taken along the CC cross section of the disposable diaper shown in FIG. The stretched state in the present invention is a state in which the disposable diaper 10 is stretched to a state in which wrinkles are not formed. Further, the natural state in the present invention means that, in the case of the disposable diaper 10 housed in the package, the disposable diaper 10 is taken out from the package and placed in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH. It has been left for 24 hours.

The disposable diaper 10 has an anteroposterior direction L and a width direction W orthogonal to each other. The anterior-posterior direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the anteroposterior direction L is a direction extending anterior-posteriorly in the deployed disposable diaper 10. Further, the disposable diaper 10 has both the front-rear direction L and the width direction W orthogonal to each other in the thickness direction T. The thickness direction T extends to the skin surface side T1 facing the wearer side and the non-skin surface side T2 opposite to the skin surface side.

The disposable diaper 10 has a front waist circumference area S1, a rear waist circumference area S2, and an inseam area S3. The front waist circumference area S1 is a region facing the front waist circumference (abdomen) of the wearer. The rear waist circumference area S2 is a region facing the rear waist circumference (back) of the wearer, and includes a region on which the body (buttocks) is placed when worn. The inseam area S3 is located in the inseam of the wearer and is an area arranged between the front waist area S1 and the rear waist area S2. The inseam area S3 is an area provided with a leg circumference opening arranged around the wearer's leg circumference. The leg circumference opening is a portion recessed inward in the width direction from the outer edge of the disposable diaper.

The disposable diaper 10 includes an absorbent core 31 containing an absorbent material. The absorbent core 31 contains an absorbent material such as ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The absorption core 31 may be covered by a core wrap 32. The absorber 30 may be composed of the absorption core 31 and the core wrap 32. The core wrap 32 is composed of a tissue and may be arranged on the skin surface side T1 of the absorption core 31 and the non-skin surface side of the absorption core.

As shown in FIGS. 1 and 3, a surface sheet 21 and a side sheet 22 may be provided on the skin surface side T1 of the absorber 30 including the absorption core 31. The surface sheet 21 may be arranged so as to straddle the center of the absorber 30 in the width direction W. The side sheets 22 may be arranged in pairs so as to cover the outer portions of the surface sheet 21 and the absorption core 31. The surface sheet 21 and the side sheet 22 may be made of a liquid-permeable sheet such as a non-woven fabric or a perforated plastic film. The inner portions of the side seats 22 may be folded back and overlapped. A leak-proof expansion / contraction portion 43 that expands / contracts in the front-rear direction L may be provided between the overlapping side sheets 22. The leak-proof expansion / contraction portion 43 may be composed of a thread rubber that expands / contracts in the front-rear direction L. The side sheet 22 and the leak-proof expansion / contraction portion 43 form a leak-proof gather 60 that stands up on the skin surface side T1 when worn.

As shown in FIGS. 1 and 3, the leak-proof gather 60 has a contraction portion 61 that stands up due to the contraction of the leak-proof expansion / contraction portion 43 and a base point that serves as an upright fulcrum of the contraction portion outside the contraction portion 61 in the width direction W. It has a part 62 and. At the base point portion 62, the side sheet 22 is joined to the surface sheet 21. The side sheet 22 is not joined to the surface sheet 21 inside the base point portion 62 in the width direction, and is configured to be able to stand up against the surface sheet 21.

A back surface sheet 23 and an exterior sheet 24 may be provided on the non-skin surface side T2 of the absorber 30. The exterior sheet 24 may be provided on the non-skin surface side T2 of the back surface sheet 23. The length of the back surface sheet 23 in the width direction W is shorter than the length of the exterior sheet 24 in the width direction W, and the length of the back surface sheet 23 in the front-rear direction L is shorter than the length of the exterior sheet 24 in the front-rear direction L. The back sheet 23 may be made of a liquid-impermeable film. The exterior sheet 24 may be made of a liquid-permeable non-woven fabric.

A fastening tape 91 is provided on the outer side of the rear waist circumference region. The fastening tape 91 has a base portion 92 and an engaging portion 93. The base portion 92 is arranged between the exterior sheet 24 and the side sheet 22 in the thickness direction T, and extends outward from the exterior sheet 24 and the side sheet 22 in the width direction W. The engaging portion 93 is arranged on the base portion 92 and engages with the target portion 95 (see FIG. 5). The target portions 95 are arranged at intervals in the width direction in the front waist circumference region S1, and are configured so that the fastening tapes 91 are attached to each other.

An indicator 51 may be arranged between the back sheet 23 and the absorber 30. The indicator 51 may extend in the front-rear direction L and may be arranged at intervals in the width direction W. The indicator 51 is arranged between the low basis weight portions 33, which will be described later. The indicator 51 is configured so that the absorber discolors when it absorbs the body fluid, and the absorption state of the body fluid can be grasped from the non-skin surface side T2 of the disposable diaper 10.

The disposable diaper 10 may have a leg circumference expansion / contraction portion 42 that expands / contracts in the front-rear direction on the outer side in the width direction from the absorption core 31. The leg circumference expansion / contraction portion 42 may be provided between the side sheet 22 and the back surface sheet 23, and between the side sheet 22 and the exterior sheet 24. The leg circumference expansion / contraction portion 42 is composed of a band-shaped expansion / contraction sheet that expands / contracts in the front-rear direction L. Due to the contraction of the leg circumference expansion / contraction portion 42, the leg circumference opening of the disposable diaper 10 fits around the leg circumference when worn.

The disposable diaper 10 may have a waist elastic portion 45 that expands and contracts at least in the width direction in the rear waist circumference region. The waist elastic portion 45 extends in the width direction W along the trailing edge of the disposable diaper. The waist elastic portion 45 may be provided between the back surface sheet 23 and the exterior sheet 24, between the front surface sheet 21 and the exterior sheet 24, and between the side sheet 22 and the exterior sheet 24. The posterior edge of the hip stretch 45 may be located anterior to the posterior edge of the disposable diaper, and the front edge of the waist stretch 45 may be located anterior to the posterior edge of the absorption core 31. The waist elastic portion 45 may extend outward in the width direction W from the absorption core 31. The waist elastic portion 45 is composed of a band-shaped elastic sheet that expands and contracts in the width direction W.

The disposable diaper 10 may have a pair of inseam telescopic portions 41 provided in a region overlapping the absorption core 31 in the inseam region. The inseam expansion / contraction portion 41 is arranged on the non-skin surface side of the absorption core 31. The inseam expansion / contraction portion 41 may be provided between the back surface sheet 23 and the exterior sheet 24. The inseam expansion / contraction portion 41 extends in the front-rear direction L and is arranged at intervals in the width direction W. The inseam expansion / contraction portion 41 is not arranged at the center of the absorption core 31 in the width direction W, but is arranged on each side of the absorption core 31 with respect to the center of the width direction W. Therefore, due to the contraction of the inseam expansion / contraction portion 41, the absorption core in the region overlapping the inseam expansion / contraction portion 41 is pulled up toward the body side from the center in the width direction of the absorption core. The pair of inseam telescopic portions 41 may be located inside the outer edge of the absorption core 31 in the width direction. The region located between the pair of inseam telescopic portions 41 is pulled up toward the body with respect to the region outside the width direction of the pair of inseam telescopic portions 41. Therefore, the center in the width direction of the absorption core is deformed convexly with the side portion as the base point, and the fit to the crotch of the body can be ensured. The inseam expansion / contraction portion 41 has a first inseam expansion / contraction portion 411 arranged on one side of the center of the absorption core 31 in the width direction W and a second inseam expansion / contraction portion arranged on the other side of the absorption core 31 with respect to the center of the width direction W. It may have a portion 412 and. The first inseam telescopic portion 411 and the second inseam telescopic portion 412 each have a plurality of elastic members arranged at intervals in the width direction W. The inseam expansion / contraction portion 41 is composed of thread rubber arranged along the front-rear direction L. In another form, the inseam expansion / contraction portion 41 may be composed of a band-shaped expansion / contraction sheet that expands / contracts in the front-rear direction, may be composed of one thread rubber, or may be composed of three or more thread rubbers. It may be configured. Further, in the present invention, the overlapping state is a state in which one member and the other member are overlapped in a plan view, and the other member is arranged on the skin surface side or the non-skin surface side of one member. It is in a state of being. The overlapping state includes not only a state in which one member and the other member are in contact with each other, but also a configuration in which another member is interposed between one member and the other member.

The inseam telescopic portion 41 may straddle the center 10LC in the front-rear direction of the disposable diaper. By contracting the inseam telescopic portion 41, the center 10LC of the disposable diaper in the anteroposterior direction can be pulled up toward the body. In particular, if the disposable diaper is folded in two so that the skin sides of the disposable diaper face each other before use, the folding habit can be improved.

At least a part of the inseam expansion / contraction portion 41 is located inside the width direction W with respect to the outer edge of the absorption core 31 in the narrow portion 35 described later. At least a part of the inseam expansion / contraction portion 41 is arranged within the range of the narrow portion 35 in the front-rear direction. The rear end edge 41R of the inseam expansion / contraction portion 41 is arranged on the front side of the rear end edge 35R of the narrow portion 35. Further, the front end edge 41F of the inseam expansion / contraction portion 41 may be arranged on the rear side of the front end edge 35F of the narrow portion 35. A region where the contraction force of the inseam expansion / contraction portion 41 is difficult to act is provided on the outside of the inseam expansion / contraction portion 41 of the absorption core 31 in the width direction W. FIG. 3 shows a side region R31 located outside the inseam expansion / contraction portion 41 in the absorption core 31 and a central region R32 between the side regions R31. The side region R31 is a region located outside the width direction W with respect to the inseam expansion / contraction portion 41 located most outside the width direction W. The central region R32 is a region including a region overlapping the inseam expansion / contraction portion 41 and a region located inside the inseam expansion / contraction portion 41 in the width direction W. The central region R32 is pulled up toward the body with respect to the side region R31 by the contraction of the inseam expansion / contraction portion 41. The deformation mode of the absorption core 31 when worn will be described in detail later.

Further, in the elastic portion including the leak-proof elastic portion 43, the leg circumference elastic portion 42, the waist elastic portion 45, and the inseam elastic portion 41 in the present invention, the elastic member such as the thread rubber or the elastic sheet can be expanded and contracted. It is an arranged part and does not include a part where an elastic member is arranged in a non-expandable state. That is, the stretchable portion is an effective length portion of the elastic member constituting the stretchable portion. In another form, the inseam telescopic portion 41 may be arranged only on the front side of the center 10LC without straddling the center 10LC in the front-back direction of the disposable diaper, or only on the rear side of the center 10LC. It may be arranged in.

(3) Configuration of Absorption Core Next, the configuration of the absorption core 31 will be described in detail with reference to FIG. 2. The absorption core 31 has a narrow portion 35 having a length shorter in the width direction than the maximum width 31M of the absorption core 31, and a wide portion arranged outside the narrow portion 35 in the front-rear direction. The narrow portion 35 is arranged between the wide portions arranged in the front-rear direction. The length of the narrow portion 35 in the width direction becomes longer toward the outside of the front-rear direction L. The shape of the absorption core 31 in a plan view is an hourglass shape. The shape of the absorber including the core wrap as well as the absorption core 31 may be an hourglass shape.

The absorption core 31 may have a low basis weight portion 33 in which the basis weight of the absorption material is lower than that of the surrounding area. The low basis weight portion 33 is provided along the front-rear direction L. The low basis weight portion 33 may extend in the front-rear direction L, may be parallel to the front-rear direction L, or may be inclined at an angle of less than 90 degrees with respect to the front-rear direction L.

The low basis weight portion 33 is a portion having a lower basis weight of the absorption material than the surrounding absorption core 31, is thinner than the surrounding absorption core 31, and has lower rigidity. Therefore, the low basis weight portion 33 tends to be a deformation base point in the mounted state. The absorption core 31 is likely to have a deformation base point extending in the front-rear direction when worn. The low basis weight portion 33 may be a portion where the basis weight of the absorbent material is substantially zero (the design basis weight is 0, but includes a portion where the surrounding absorbent material is mixed), or the periphery. It may be a portion where an absorbent material having a smaller basis weight is arranged. The low basis weight portion 33 may be a slit having a constant length in the width direction W, or may be a notch in which the length in the width direction W is practically zero. The length of each low basis weight portion 33 in the width direction W may be 2 mm or more and 10 mm or less, and more preferably, the thickness of the absorption core 31 or more and 8 mm or less. When the length of the low basis weight portion 33 in the width direction is equal to or larger than the thickness of the absorption core 31, the absorption core 31 is easily deformed in the thickness direction with the low basis weight portion 33 as the base point. Further, since the length of the low basis weight portion 33 in the width direction is 8 mm or less, the front and rear of the low basis weight portion 33 that can suppress anxiety about absorption performance due to the long length of the low basis weight portion in the width direction. The length of the direction L may be 30 mm or more and 180 mm or less.

The low basis weight portions 33 are arranged in pairs at intervals in the width direction W. The low basis weight portions 33 may be arranged on both sides of the center 10WC in the width direction of the disposable diaper at intervals in the width direction W. The center of the low basis weight portion 33 in the front-rear direction may be arranged behind the center 10LC in the front-back direction of the disposable diaper. The front end edge 33F of the low basis weight portion 33 may be located on the front side of the front end edge 41F of the inseam expansion / contraction portion 41, and the rear end edge 33R of the low basis weight portion 33 is the rear end edge 41R of the inseam expansion / contraction portion 41. It may be located anterior to the coincidence or trailing edge 41R. The outer edge of the low basis weight portion 33 may coincide with the thread rubber located outside in the width direction among the thread rubbers constituting the inseam expansion / contraction portion 41 in the width direction, and the inner edge of the low basis weight portion 33 may be aligned with the thread rubber. Of the thread rubbers constituting the inseam expansion / contraction portion 41, the thread rubber located inside in the width direction may coincide with the thread rubber in the width direction.

The absorption core 31 may have a high-rigidity portion 70 having a higher rigidity than the surrounding region. The high-rigidity portion 70 includes a central high-rigidity portion 71 arranged between the pair of inseam expansion / contraction portions 41, a rear high-rigidity portion 72 arranged behind the inseam expansion / contraction portion 41, and an inseam expansion / contraction portion 41. It may have a front high-rigidity portion 73 arranged on the front side. The central high-rigidity portion 71, the rear high-rigidity portion 72, and the front high-rigidity portion 73 are separated from each other in the front-rear direction L.

The high-rigidity portion 70 is a region having higher bending rigidity than the surrounding region. The high-rigidity portion 70 may be a portion having a higher basis weight than the surrounding region, or may be a portion where the absorption core 31 is compressed in the thickness direction. The high-rigidity portion 70 of the present embodiment is a portion provided with a compressed portion in which the absorption core 31 is compressed. The squeezed portion may be formed by squeezing at least the absorption core 31 in the thickness direction T, and may be formed by squeezing another member such as the core wrap 32 and the absorption core 31.

The central high-rigidity portion 71 is provided in the region between the pair of low basis weight portions 33. The front end edge 71F of the central high-rigidity portion 71 may coincide with the front end edge 33F of the low basis weight portion 33 or may be located on the rear side of the front end edge 33F of the low basis weight portion 33. The rear end edge 71R of the central high-rigidity portion 71 may be located on the front side of the rear end edge 33R of the low basis weight portion 33. The center in the front-rear direction of the central high-rigidity portion 71 may be arranged in front of the center in the front-rear direction of the low basis weight portion 33. The central high-rigidity portion 71 may be arranged at a distance from the low basis weight portion 33 in the width direction W. The central high-rigidity portion 71 may straddle the center 10LC in the front-rear direction of the disposable diaper and the center 10WC in the width direction W of the disposable diaper.

The inseam expansion / contraction portion 41 may be located on both sides of the center of the central high-rigidity portion 71 in the width direction, and may extend to the rear side of the central high-rigidity portion 71. In the absorption core 31, the first region R41 in which the inseam expansion / contraction portion 41 is arranged behind the central high-rigidity portion 71, and the central high-rigidity portion 71 and the inseam expansion / contraction portion 41 overlap each other in the thickness direction or the width direction. It may have two regions R42 and a third region R43 in which the central high-rigidity portion 71 is arranged on the front side of the inseam expansion / contraction portion 41. The first region R41 and the second region R42 are adjacent to each other in the front-rear direction L, and the second region R42 and the third region R43 are adjacent to each other in the front-rear direction L. The trailing edge of the first region R41 coincides with the trailing edge 41R of the inseam telescopic portion 41, and the front edge of the first region R41 coincides with the trailing edge 71R of the central high-rigidity portion 71. The trailing edge of the second region R42 coincides with the front edge of the first region R41, and the front edge of the second region R42 coincides with the front edge 41F of the inseam telescopic portion 41. The trailing edge of the third region R43 coincides with the front edge of the second region R42, and the front edge of the third region R43 coincides with the front edge 71F of the central high-rigidity portion 71.

The rear high rigidity portion 72 may be arranged on the rear side of the low basis weight portion 33. The outer edge of the rear high-rigidity portion 72 may extend outward in the width direction W toward the rear side. The length of the front end edge of the rear high-rigidity portion 72 in the width direction W may be longer than the length of the central high-rigidity portion 71 in the width direction W. The rear high-rigidity portion 72 may straddle the center 10WC of the width direction W of the disposable diaper.

The front high-rigidity portion 73 may be arranged on the front side of the low basis weight portion 33. The front high-rigidity portions 73 may be arranged on both sides of the center 10WC of the width direction W of the disposable diaper at intervals in the width direction W. The front edge of the front high-rigidity portion 73 may extend forward toward the outside in the width direction W.

The absorption core 31 may have a pair of deformation base points 85 provided behind the inseam expansion / contraction portion 41. The deformation base point portions 85 are arranged in pairs on the rear side of the inseam expansion / contraction portion 41 so as to extend toward the rear side toward the outside of the width direction W and at intervals in the width direction W. The deformation base point portion 85 serves as a base point at which the absorption core 31 is deformed in the thickness direction. The deformation base point portion 85 of the present embodiment is composed of the outer portion 72S of the rear high rigidity portion 72. The deformation base point portion 85 has a base point edge 85E which is an edge of the deformation base point. The base point edge is an edge on which a polygonal line having the thickness of the absorption core 31 is formed. The base point edge 85E of the present embodiment is the outer edge 72E of the rear high rigidity portion 72. The modified base point portion 85 of the present embodiment includes a region extending inward in the width direction W from the base point edge 85E to the thickness of the absorption core 31.

Here, the outer portion in the present invention is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is the outer edge in the width direction W. Further, the inner portion is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W. The deformation base point portion 85 may be a base point at which the absorption core 31 is deformed in the thickness direction, and is not limited to the outer portion of the high-rigidity portion by the squeezing portion. The deformation base point portion in another embodiment will be described later.

(4) Deformation mode when the disposable diaper is worn Next, a deformation mode when the disposable diaper 10 is worn will be described with reference to FIGS. 6 to 8. FIG. 6 is a diagram schematically showing a wearing state of a disposable diaper in the AA cross section. FIG. 7 is a diagram schematically showing a wearing state of a disposable diaper according to an embodiment, and is a view of a sleeping wearer visually recognized from the front side. FIG. 8 is a diagram for explaining a deformation mode of the absorption core when worn, and shows a plane of the absorption core. The solid line in FIG. 9 shows the absorption core 31 and the inseam expansion / contraction portion 41 before deformation, and the two-dot chain line shows the absorption core 31 and the inseam expansion / contraction portion 41 after deformation. In FIG. 7, for convenience of explanation, only the absorption core 31, the inseam expansion / contraction portion 41, and the waist circumference expansion / contraction portion 45 are shown, and other members are omitted. FIG. 9 is a diagram for explaining a deformation mode of the absorber at the time of wearing in the BB cross section of the disposable diaper. The line BL shown in FIG. 6 indicates the line of the wearer's body.

The absorption core 31 in the inseam region S3 is pulled up toward the body by the contraction of the inseam expansion / contraction portion 41. A pair of inseam expansion / contraction portions 41 are located on both outer sides of the center of the width direction W, and the portion overlapping with the inseam expansion / contraction portion 41 is pulled up by the contraction of the inseam expansion / contraction portion 41, and the region sandwiched by the left and right inseam expansion / contraction portions 41. Is pulled up while maintaining a flat shape that fits the body. The pair of inseam telescopic portions 41 are located inside the outer edge 31E of the absorption core 31 in the width direction, and the central region R32 located between the pair of inseam telescopic portions 41 is pulled up toward the body with respect to the side region R31. Be done. Therefore, the center in the width direction of the absorption core is deformed convexly with the side portion as the base point, and the fit to the crotch of the body can be ensured. Further, when the central region R32 is pulled up toward the body side, the narrow portion 35 is pulled inward in the width direction in the region where the narrow portion 35 and the inseam expansion / contraction portion 41 overlap in the width direction, and the rear end edge of the inseam expansion / contraction portion 41 is pulled. The first polygonal line FL1 connecting the 41R and the trailing edge 35R of the narrow portion 35 is formed. As shown in FIG. 2, the first polygonal line FL1 reaches the outer edge 31E of the absorption core 31 located on both sides in the width direction from the rear end edge 41R of the inseam telescopic portion 41. When the inseam expansion / contraction portion 41 is composed of a plurality of elastic members as in the present embodiment, the first folding line FL1 is the rear end edge of the elastic member located on the outer side in the width direction and the narrow portion 35. It is easy to be formed so as to connect the trailing edge 35R. The deformation by the pair of inseam expansion / contraction portions 41 is guided to the outer edge 31E of the absorption core 31 along these first polygonal lines FL1, and the deformation by the inseam expansion / contraction portion 41 can be suppressed from being transmitted to the rear waist circumference region side. The fit to the buttocks can be ensured and the back leakage can be suppressed.

In addition, by forming the first polygonal line FL1, deformation that shortens the distance of the first polygonal line FL1 is suppressed, and the rear end edge 35R of the narrow portion 35 moves inward in the width direction. Oppose. Therefore, the rear end edge 35R of the narrow portion 35 is difficult to move inward in the width direction W, and the width of the absorption core 31 in the rear waist circumference region S2 can be secured. Therefore, the absorption core can cover the buttocks in a wide area and prevent leakage.

The front end edge 41F of the inseam expansion / contraction portion 41 may be arranged on the rear side of the front end edge 35F of the narrow portion 35. When the central region R32 is pulled up toward the wearer with respect to the side region R31 and the absorption core 31 is deformed in a convex shape, the second polygonal line FL2 connecting the front end edge 41F of the inseam expansion / contraction portion 41 and the front end edge 35F of the narrow portion 35. Is also formed. As shown in FIG. 2, the second polygonal line FL2 also reaches the outer edge 31E of the absorption core 31 located on both sides in the width direction from the front end edge 41F of the inseam telescopic portion 41. When the inseam expansion / contraction portion 41 is composed of a plurality of elastic members as in the present embodiment, the second folding line FL2 is the front end edge of the elastic member located on the outer side in the width direction and the narrow portion 35. It is easy to be formed so as to connect the front end edge 35F. It is possible to suppress the deformation caused by the inseam expansion / contraction portion 41 from being transmitted to the front waist circumference region S1 side. The fit to the abdomen can be ensured and the front leakage can be suppressed.

Further, the second polygonal line FL2 faces the force of the front end edge 35F of the narrow portion 35 moving inward in the width direction W, and the width of the absorption core 31 in the front waist circumference region S1 can be secured. Therefore, the abdomen can be covered with a large area by the absorption core 31, and leakage can be further suppressed.

The distance W11 between the inseam telescopic portion 41 and the outer edge 31E of the absorption core 31 may be 1/4 or more of the length W12 between the outer edges 31E of the absorption core 31. The outer edge 31E of the absorption core 31 referred to here is an outer edge in a region extending in the width direction W from the inseam expansion / contraction portion 41. That is, W11 × 4> W12 may be satisfied on an arbitrary straight line that passes through the inseam expansion / contraction portion 41 and extends in the width direction W.

When the inseam telescopic portion 41 is deformed convexly toward the body as a base point, the region outside the inseam telescopic portion 41 in the width direction W becomes a region that supports the convex deformation. Since the side region R31 outside the width direction W of the inseam expansion / contraction portion 41 is 1/4 or more of the entire width direction of the absorption core 31, it stably supports the convex deformation and maintains the convex shape. It will be easier. Further, since the rigidity of the region outside the inseam expansion / contraction portion 41 in the width direction is higher, the narrow portion 35 of the absorption core 31 is not deformed too much in a convex shape, and the area covered by the absorption core 31 can be secured. .. Leakage can be further suppressed by covering the body with a large area by the absorption core.

As shown in FIG. 3, in the extended state of the disposable diaper, the distance W21 in the width direction between the apex of the contraction portion 61 and the base point portion 62 is the outer edge of the absorption core 31 in the narrow portion 35 and the inseam expansion / contraction portion 41. It may be longer than the distance W22 in the width direction. Here, the apex of the contracted portion 61 is the inner edge of the side seat 22. Further, in the configuration in which the length of the narrow portion 35 in the width direction changes, W21> W22 is satisfied on an arbitrary straight line that passes through the narrow portion 35 and the inseam expansion / contraction portion 41 and extends in the width direction W. You just have to.

The leak-proof gather 60 stands on the wearer side with the contracted portion 61 as the apex due to the contraction of the leak-proof stretchable portion 43. The maximum height of the upright portion of the leak-proof gather 60 when standing is the distance W21 in the width direction between the apex of the contraction portion 61 and the base point portion 62. Further, the maximum height of the convex deformation in the region where the narrow portion 35 is provided is the distance W22 between the outer edge of the narrow portion 35 and the inseam expansion / contraction portion 41. Since the distance W21 is longer than the distance W22, the height of the leak-proof gather 60 is higher than the height of the convex deformation, and the leak-proof gather 60 can suppress lateral leakage.

The distance between the elastic members of the first inseam telescopic portion 411 and the distance between the elastic members of the second inseam telescopic portion 412 may be 3 times or less the thickness of the absorption core. Here, the thickness of the absorption core 31 is the maximum thickness of the absorption core. The distance between the elastic members of the first inseam expansion / contraction portion 411 and the distance between the elastic members of the second inseam expansion / contraction portion 412 are the distances between the two rubber threads in the present embodiment. Since the first inseam expansion / contraction portion 411 and the second inseam expansion / contraction portion 412 each have a plurality of elastic members, the force for pulling up the absorption core becomes stronger, and it becomes easier to maintain the convex shape of the absorption core. When the distance between the elastic members of the first inseam expansion and contraction portion 411 and the distance between the elastic members of the second inseam expansion and contraction portion 412 are more than three times the thickness of the absorption core, each elastic member independently absorbs the absorption core. It may be difficult to pull up the absorption core by integrating the elastic members. Since the distance between the elastic members is 3 times or less of the thickness of the absorption core 31, the plurality of elastic members of the first inseam expansion / contraction portion 411 are integrated to pull up the absorption core, and the plurality of second inseam expansion / contraction portions 412. The elastic members can be integrated to pull up the absorption core. Therefore, it becomes easier to form the convex shape of the absorption core 31.

The absorption core 31 in the inseam region S3 may be provided with a high-rigidity portion having a higher rigidity than the surrounding region between the pair of inseam expansion / contraction portions 41. The high-rigidity portion may straddle the center of the absorption core 31 in the width direction. The high-rigidity portion enhances the rigidity, and the absorption core tends to have a surface shape that follows the body. The area between the pair of inseam telescopic portions 41 is not deformed too much in a convex shape, and the area covering the body can be secured by the absorption core 31. Further, since the high-rigidity portion is provided straddling the center in the width direction of the absorption core 31, the absorption core is arranged along the excretion port of the body to improve the drawing property of the body fluid and prevent leakage. Can be suppressed

The high-rigidity portion may be the central high-rigidity portion 71, or may be a grid-squeezed portion (not shown) arranged in a grid pattern. The lattice pressing portion may be formed by compressing at least the absorption core in the thickness direction, and may be formed not only in the region between the pair of inseam expansion / contraction portions 41 but also on the entire surface of the absorption core.

The waist-retracting portion 45 may be arranged in a region R11 overlapping the absorption core 31 on the rear side of the narrow portion 35 and on the outside of the inseam expansion / contraction portion 41 in the width direction W. As described above, the first polygonal line FL1 extending from the rear end edge 41R of the inseam expansion / contraction portion 41 reaches the rear end edge 35R of the narrow portion 35. The first polygonal line FL1 faces the force at which the rear end edge 35R of the narrow portion 35 moves inward in the width direction W, and the rear end edge 35R of the narrow portion 35 is difficult to move inward in the width direction W. Become.

As shown in FIG. 8, the length of the absorption core 31 in the region overlapping with the waist-circling expansion / contraction portion 45 is shortened in the width direction W due to the contraction of the waist-circle expansion / contraction portion 45. At this time, the region R11 on the rear side of the narrow portion 35 and on the outer side in the width direction from the inseam expansion / contraction portion 41 is the width direction W with respect to the rear end edge 35R of the narrow portion 35 due to the contraction of the waist circumference expansion / contraction portion 45. It is easy to deform inside. At this time, the rear end edge 35R of the narrow portion 35 becomes a deformation base point and is difficult to move inward in the width direction W. The rear end edge 35R of the narrow portion 35 located on the rear side of the inseam expansion / contraction portion 41 becomes more difficult to move due to the inside of the width direction W, and the length of the absorption core 31 in the rear waist circumference region S2 in the width direction W is further secured. It is easy to do and can suppress back leakage.

As shown in FIG. 8, the waist elastic portion 45 has a first region 451 and a second region 452 having a higher elongation rate in the width direction than the first region 451 and is the rear end of the inseam elastic portion 41. A first region 451 may be arranged on the first extension line EL1 extending rearward from the edge 41R. The second region 452 is provided in a region straddling the center in the width direction of the disposable diaper and an outer portion of the waist-circling expansion / contraction portion 45. The first region 451 is sandwiched by the second region 452. The first region 451 and the second region 452 of the waist circumference expansion / contraction portion 45 have different elongation rates in the width direction. The first region 451 has a low elongation rate and is less likely to shrink than the second region 452. Since the first region 451 is provided on the first extension line EL1, the region that is deformed convexly due to the contraction of the inseam expansion / contraction portion 41 is not easily contracted in the width direction due to the contraction of the waist circumference expansion / contraction portion 45, and is convex. It is easy to maintain the deformed state. In the form in which a plurality of elastic members constituting the inseam expansion / contraction portion 41 are provided, the first region 451 may be arranged on the first extension line EL1 of at least one of the elastic members.

Further, the elongation rate of the waist-surrounding expansion / contraction portion 45 can be adjusted by changing the expansion ratio at the time of manufacturing or changing the number of elastic members arranged. Further, in the form in which the waist-circling expansion / contraction portion 45 is stretched by a gear in the width direction W, the gear stretching in the region where the stretching ratio is lowered (for example, the first region 451) is weakened when stretching by the gear. do. The gear extension in the region where the elongation rate is high (for example, the second region 452) is strengthened. The strength of the gear extension can be adjusted by changing the depth of the convex portion of the gear, the pitch of the convex portion of the gear, and the number of times the gear is extended. The elongation rate of the strongly stretched region is relatively high, and the elongation rate of the weakly stretched region is relatively low.

The second region 452 may be arranged on the second extension line EL2 extending rearward from the region (side region R31 shown in FIG. 8) located outside the inseam expansion / contraction portion 41 in the width direction. The second extension line EL2 is a line extending rearward from the side region R31, and is provided at a plurality of positions having different positions in the width direction. The second region 452 may be arranged on any of the second extension lines EL2. In the region outside the inseam expansion / contraction portion in the width direction, the absorption core 31 is more easily deformed inside in the width direction with the rear end edge 35R of the narrow portion 35 as a base point. The rear end edge 35R of the narrow portion 35 located on the rear side of the inseam expansion / contraction portion 41 becomes more difficult to move due to the inside of the width direction W, and the length of the absorption core 31 in the rear waist circumference region S2 in the width direction W is further secured. It is easy to do and can suppress back leakage.

A leg circumference expansion / contraction portion 42 may be arranged on the first virtual line VL1 connecting the front end edge of the inner edge of the engagement portion 93 of the fastening tape 91 and the rear end edge 41R of the inseam expansion / contraction portion 41. When wearing the tape-type disposable diaper 10, first, the wearer's buttocks are placed on the rear waist circumference area S2 of the disposable diaper 10 with the disposable diaper 10 unfolded. Then, a disposable diaper 10 is passed between the wearer's legs, the diaper is pulled toward the inseam region, and the body is covered by the inseam region. Then, the engaging portion 93 of the fastening tape 91 is fastened to the front waist circumference region S1.

As shown in FIG. 1, the first virtual line VL1 connecting the front end edge of the inner edge of the engaging portion 93 and the rear end edge of the inseam telescopic portion is in the width direction when the fastening tape 91 is pulled during mounting. A force that pulls outward acts. The rear end edge 41R of the inseam expansion / contraction portion 41 is pulled outward in the width direction W by the operation at the time of mounting, and the absorption core 31 convexly deformed toward the body side by the inseam expansion / contraction portion 41 is also pulled outward in the width direction. Therefore, it is easy to suppress the convex deformation of the absorption core 31 from falling inward in the width direction and to maintain the convex deformation state on the body side. Further, the leg circumference expansion / contraction portion 42 is arranged on the first virtual line VL1, and the leg circumference expansion / contraction portion 42 can also be pulled up at the time of mounting. Therefore, the fit to the excretion opening of the crotch and the fit to the leg circumference can be improved, and leakage can be further suppressed.

A pair of deformation base points 85 may be provided on the absorption core 31 on the rear side of the inseam expansion / contraction portion 41. At the time of wearing, when the disposable diaper 10 is passed between the wearer's legs and the diaper is pulled toward the inseam region, the absorption core 31 is easily deformed with the deformation base point portion 85 as the base point. The deformation base point portion 85 is provided on the rear side of the inseam expansion / contraction portion 41 located in the inseam region, and the deformation base point of the absorption core 31 is formed on the rear side of the inseam expansion / contraction portion 41. The deformation base point portion 85 extends toward the outside in the width direction W toward the rear side, and the absorption core 31 is formed with a deformation base point extending inward in the width direction W from the rear waist circumference region toward the inseam region. To.

Therefore, when the buttocks are placed on the back waist area and the diaper is pulled toward the inseam area, the absorber is deformed by the base point extending inward in the width direction W from the rear waist area toward the inseam area. Specifically, as shown in FIG. 9, the absorber in the region where the deformation base point portion 85 is provided is deformed with the outer edge 72E of the rear high rigidity portion 72 (base point edge 85E of the deformation base point portion 85) as a base point. However, the region inside the width direction W from the outer edge 72E is arranged closer to the skin surface side than the region outside the width direction W than the outer edge 72E. The reason why the region inside the width direction W from the outer edge 72E is arranged on the skin surface side from the region outside the width direction W from the outer edge 72E is that the absorption core 31 is arranged due to the contraction of the inseam expansion / contraction portion 41. The center of the width direction W is pulled up toward the body, and when the wearer pulls the diaper, a force is generally applied to the center of the width direction W of the absorption core 31, and the outer part of the absorbent article (when worn). This is because the center of the absorption core 31 in the width direction W is pulled up while the leg circumference opening (near the leg circumference opening) is caught by the leg. By deforming the absorption core 31 with the deformation base point portion 85 as the base point, the absorption core 31 is deformed so that the length of the width direction W becomes shorter toward the inseam region side.

As shown in FIGS. 6 and 7, the absorption core 31 located in front of the deformation base point 85 is deformed convexly toward the body due to the contraction of the pair of inseam expansion / contraction portions 41, and the central region R32 is the side region R31. Stand up against. Therefore, the absorption core 31 in the inseam region is arranged along the body side, and the absorption core 31 can be appropriately accommodated in the crotch of the wearer.

The absorption core 31 can be compactly stored in the gap between the wearer's feet while covering the absorption core 31 with a large area for the wearer's buttocks. By placing the disposable diaper in an appropriate position in the wearer's crotch, the anterior girth area can be pulled to a position that covers the wearer's abdomen. In the tape-type disposable diaper, the wearer's body can be appropriately covered and leakage can be suppressed.

As shown in FIG. 1, the deformation base point portion 85 may be arranged inside the second virtual line VL2 connecting the rear end edge 41R of the inseam expansion / contraction portion 41 and the rear end edge 35R of the narrow portion 35. .. The second virtual line VL2 connecting the rear end edge of the inseam telescopic portion and the rear end edge of the narrow portion is a line on which the first polygonal line FL1 is formed, and the rear end edge 35R of the narrow portion 35 is inside in the width direction. It becomes a line facing the force moving to. The area sandwiched by the first polygonal line FL1 is arranged so as to cover the body. On the rear side of the inseam expansion / contraction portion 41 in the region sandwiched by the first polygonal line FL1, the absorption core 31 is deformed by the deformation base point portion 85. The deformation base point portion 85 extends outward in the width direction toward the rear side, and the absorption core 31 is formed with a deformation base point extending inward in the width direction from the rear waist circumference region S2 toward the inseam region S3. , It is deformed so that the length of W in the width direction becomes shorter toward the inseam region side. The absorbent core fits from the buttocks to the crotch of the wearer, further suppressing leakage.

The angle α of the second virtual line VL2 with respect to the width direction may be smaller than the angle β of the deformation base point portion 85 with respect to the width direction. Since the angle α of the second virtual line VL2 with respect to the width direction is small, the movement of the trailing end edge 35R of the narrow portion 35 in the width direction can be further suppressed, and the width of the absorption core 31 in the rear waist circumference region S2 is further secured. can. Further, since the angle β of the deformation base point 85 with respect to the width direction is relatively large, the region sandwiched by the second virtual line VL2 is partially deformed, and the body is deformed by the region outside the width direction of the deformation base 85. Can be covered. Therefore, the absorption core can cover the buttocks in a wide area and leakage can be suppressed.

The outer edge of the inseam telescopic portion 41 may be arranged outside the outer edge of the deformation base point portion 85 in the width direction W. However, more preferably, the outer edge of the inseam telescopic portion 41 may be arranged inside the width direction W with respect to the outer edge of the deformation base point portion 85. According to such a configuration, the deformation of the absorption core 31 with the deformation base point portion 85 as the base point and the deformation of the absorption core 31 by the inseam expansion / contraction portion 41 are more easily linked. Therefore, it becomes easier to arrange the absorption core 31 deformed so that the length of the width direction W becomes shorter from the rear waist circumference region toward the inseam region side closer to the body side in the inseam region. The outer edge of the inseam telescopic portion 41 is the outer edge of the elastic member located on the outermost side in the width direction W among the elastic members constituting the inseam telescopic portion 41. The thread rubber constituting the inseam expansion / contraction portion 41 of the present embodiment is arranged along the front-rear direction, and the elastic member located outside the width direction W constitutes the outer edge of the inseam expansion / contraction portion 41.

The deformation base point portion 85 and the inseam expansion / contraction portion 41 may be displaced in the width direction W. However, more preferably, at least a part of the deformation base point portion 85 may be arranged on the first extension line EL1 extending rearward from the rear end edge of the inseam expansion / contraction portion 41. The deformation of the absorption core 31 with the deformation base point portion 85 as the base point and the deformation of the absorption core 31 by the inseam expansion / contraction portion 41 are more easily linked. Therefore, it becomes easier to arrange the absorption core 31 deformed so that the length of the width direction W becomes shorter from the rear waist circumference region toward the inseam region side closer to the body side in the inseam region. In the form in which a plurality of elastic members constituting the inseam expansion / contraction portion 41 are provided, it is sufficient that the deformation base point portion 85 is arranged on the first extension line EL1 of at least one of the elastic members.

The deformation base point portion 85 may straddle the first intermediate line ML1 located in the middle of the front-rear direction L between the center 10LC of the disposable diaper in the front-rear direction and the front end edge of the engaging portion 93 in the front-rear direction L. As shown in FIG. 1, the first intermediate line ML1 is a line that passes through the center 10LC in the front-rear direction of the disposable diaper and the front end edge of the engaging portion 93 in the front-rear direction and extends in the width direction W. The area behind the first intermediate line ML1 is generally the area on which the buttocks are placed when worn. The deformation base point portion 85 straddles the first intermediate line ML1 in the front-rear direction, and is arranged from the region where the buttocks of the wearer are placed to the region where the buttocks cannot be placed. At the time of mounting, the area behind the first intermediate line ML1 is pressed by the buttocks, the area where the buttocks are not placed is pulled to the front side, and the absorption core 31 is further deformed with the deformation base point 85 as the base point. easy. Therefore, the absorbent core 31 can be deformed so that the width of the absorbent core 31 is shortened, the disposable diaper can be placed at an appropriate position in the crotch of the wearer, and the wearer's body can be appropriately covered.

Further, the rear end edge 41R of the inseam expansion / contraction portion 41 may be arranged on the front side of the first intermediate line ML1. The rear end edge 41R of the inseam telescopic portion 41 is arranged in an area where the wearer's buttocks cannot be placed. At the time of mounting, the region on the rear side of the first intermediate line ML1 is pressed by the buttocks, and the region on which the buttocks are not placed is pulled to the front side, and the inseam expansion / contraction portion 41 is more easily extended. Therefore, the area where the inseam expansion / contraction portion 41 is arranged is more easily pulled up with respect to the body, and the absorption core 31 can be appropriately accommodated in the crotch of the wearer.

Further, in the modified example, the rear end edge 41R of the inseam expansion / contraction portion 41 may be located on the rear side of the first intermediate line ML1. At the time of mounting, the front end edge 41F side of the inseam expansion / contraction portion 41 is pulled forward while the rear end edge 41R of the inseam expansion / contraction portion 41 is pressed by the buttocks, and the inseam expansion / contraction portion 41 is easily extended. Therefore, the area where the inseam expansion / contraction portion 41 is arranged can be pulled up with respect to the body, and the absorption core can be appropriately accommodated in the crotch of the wearer.

The front end edge of the deformation base point portion 85 may be arranged in front of the second intermediate line ML2 located between the rear end edge of the deformation base point portion 85 and the rear end edge of the inseam expansion / contraction portion 41 in the front-rear direction. As shown in FIG. 1, the second intermediate line ML2 is a line that passes through the middle in the front-rear direction between the rear end edge of the deformation base point portion 85 and the rear end edge 41R of the inseam expansion / contraction portion 41 and extends in the width direction W. .. The deformation base point portion 85 is provided over a region of more than half of the region between the rear end edge of the deformation base point portion 85 and the rear end edge of the inseam expansion / contraction portion 41. Therefore, the deformation of the absorption core 31 with the deformation base point portion 85 as the base point and the deformation of the absorption core 31 by the inseam expansion / contraction portion 41 are likely to be linked. Therefore, the absorption core 31 can be easily deformed into a shape along the body from the rear waist circumference region S2 to the inseam region S3, and the absorption core 31 can be compactly arranged in the inseam region while covering the buttocks. Disposable diapers can be placed appropriately in the wearer's crotch to properly cover the wearer's body.

A high-rigidity portion having higher rigidity than the region outside the width direction W of the deformation base point portion 85 may be provided between the pair of deformation base point portions 85. In the present embodiment, the outer portion of the rear high-rigidity portion constitutes the deformation base point portion 85, and the region between the outer portions of the rear high-rigidity portion constitutes the high-rigidity portion of the present configuration. Since the high rigidity portion is provided between the deformation base point portions 85, a rigidity difference occurs between the region outside the width direction W of the deformation base point portion 85 and the region inside the deformation base point portion 85, and the deformation base point portion The absorption core 31 is more easily deformed with 85 as a base point. Therefore, the absorption core 31 is easily deformed so that the length of the width direction W becomes shorter toward the inseam region side, and the absorption core 31 is more easily accommodated in the crotch of the wearer. By placing the disposable diaper in an appropriate position in the wearer's crotch, the wearer's body can be properly covered. In the deformation base point portion having relatively low rigidity (for example, the deformation base point portion composed of a low basis weight portion), the rigidity of the high rigidity portion between the pair of deformation base point portions 85 is higher than the rigidity of the deformation base point portion. May be high.

The high-rigidity portion between the pair of deformation base points 85 may be adjacent to the deformation base point 85 in the width direction W. The region outside the deformation base point portion W in the width direction W is more likely to be deformed with respect to the region between the deformation base point portions 85, and the absorption core 31 is more likely to be deformed due to the difference in rigidity. Further, the pair of deformation base points 85 are integrated by the high rigidity portion. The deformation base point portion 85 and the high-rigidity portion are integrated and easily deformed in a convex shape toward the wearer side, so that the absorption core 31 can be more easily accommodated in the wearer's crotch.

The high-rigidity portion between the deformation base point portion 85 and the deformation base point portion 85 of the present embodiment is composed of a rear high-rigidity portion composed of a squeezed portion. As described above, the deformation base point portion 85 and the high rigidity portion may be formed integrally, and the boundary between the deformation base point portion 85 and the high rigidity portion may not be formed. The entire rear high-rigidity portion may exhibit the function as the deformation base point portion 85 and the function as the high-rigidity portion. Further, the deformation base point portion 85 formed of the squeezed portion has high rigidity, and the deformation of the absorption core 31 becomes easier to stabilize.

The pair of deformation base points 85 are arranged so as to sandwich the center of the width direction W of the disposable diaper, and at least a part of the deformation base point portion 85 is the center of the width direction W of the absorption core 31 and the maximum width of the absorption core 31. It may be arranged outside the width direction W from the third intermediate line ML3 located in the middle of. As shown in FIG. 1, the third intermediate line ML3 is a line that passes through the center of the width direction W of the absorption core 31 and the center of the maximum width of the absorption core 31 and extends in the front-rear direction. In a region of half or more of the width direction W of the absorption core 31, the absorption core 31 is easily deformed with the deformation base point portion 85 as the base point. The absorption core 31 is easily deformed so that the length of the width direction W becomes shorter toward the inseam region side in a wide range of the absorption core 31, and the absorption core 31 is more easily accommodated in the crotch of the wearer.

The leg circumference expansion / contraction portion 42 may be arranged on the third extension line EL3 extending outward in the width direction W from the deformation base point portion 85. The third extension line EL3 is a line extending outward in the width direction W from an arbitrary position of the deformation base point portion 85, and is provided at a plurality of positions having different positions in the front-rear direction. It suffices that at least a part of the leg circumference expansion / contraction portion 42 is arranged on any of the third extension lines EL3. When the buttocks are placed on the back waist area and the diaper is pulled toward the inseam area, the rear waist area is pressed by the buttocks, and the area outside the width direction W of the absorption core 31 is in close contact with the legs. Since the absorption core 31 is deformed while the leg circumference expansion and contraction portion and the buttocks are fitted to the body, the central region R32 easily rises with respect to the side region R31 on the front side of the buttocks, and the absorption core 31 deforms the deformation base point portion 85. It becomes easier to deform as a base point.

Further, the leg circumference expansion / contraction portion 42 may be arranged on an extension line extending outward in the width direction W from the inseam expansion / contraction portion 41. By deforming the absorption core 31 in a state where the elastic portion around the legs fits the body, the central region R32 becomes easier to stand up with respect to the side region R31. The contraction of the inseam expansion / contraction portion 41 makes it easier for the absorption core 31 to be pulled up toward the wearer.

The leg around extension / contraction portion 42 may extend toward the rear side toward the outside in the width direction W. The leg-rotating elastic portion extending outward in the width direction W toward the rear side is in close contact with the body, so that the wearer's buttocks can be covered with a disposable diaper. The absorption core 31 can be deformed so that the length of the absorption core 31 in the width direction W becomes shorter toward the inseam region while covering the buttocks in a wide range toward the rear side. While properly accommodating the absorbent core 31 in the crotch of the wearer, the disposable diaper can cover the entire body and prevent leakage.

Outside the absorption core 31 in the width direction W, there is a side flap portion 27 extending toward the outside in the width direction W toward the rear side, and the side flap portion 27 is arranged on the second extension line EL2. good. The side flap portion 27 is a portion of the outer portion of the disposable diaper that extends toward the rear side toward the outside in the width direction W, and is a portion shown with diagonal lines in FIG. When the buttocks are placed on the rear waist area and the diaper is pulled toward the inseam area, the rear waist area is pressed by the buttocks, and the side flaps on the outer side in the width direction W of the absorption core 31 are more likely to hit the legs. Therefore, the absorption core 31 is deformed in a state where the side flap portion located outside in the width direction W and the region on which the buttocks are placed are held down, and the absorption core 31 is more easily deformed with the deformation base point portion 85 as the base point.

The low basis weight portion 33 may be arranged in the area overlapping the inseam expansion / contraction portion 41. The absorption core 31 is deformed from a low basis weight portion extending in the front-rear direction when worn. Therefore, the absorption core 31 is more likely to be deformed in a convex shape toward the body due to the contraction of the inseam expansion / contraction portion 41, and the absorption core 31 can be appropriately accommodated in the crotch of the wearer. The low basis weight portion 33, which is the deformation base point of the absorption core 31, has a lower basis weight than the surrounding region, can suppress the thickness even after absorbing the body fluid, and can maintain the deformed state.

The measurement of the "basis weight of the absorption core" in the present specification shall be performed by the following measurement method. If the disposable diaper 10 is enclosed in a package or the like, take it out of the package and use a sample left in that state for 12 hours in an atmosphere of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH. For disposable diapers wrapped with a wrapping sheet or the like, the wrapping sheet is opened and the folded disposable diaper is unfolded. Next, the part for measuring the basis weight is cut out from the disposable diaper, and the part other than the absorption core such as the surface sheet is removed from the cut out part. Then, the area and weight of the portion for measuring the basis weight of the absorption core are measured. Calculate the basis weight based on the weight and area.

The "flexural rigidity" in the present specification may be a value measured by Garley rigidity and softness. The garley stiffness and softness can be measured in accordance with JIS-L1096 using a No. 311 garley type flexibility tester manufactured by Yasuda Seiki Seisakusho Co., Ltd. The length W in the width direction of the sample for measuring the Gurley stiffness and softness can be 30 mm, and the length in the anteroposterior direction can be 25 mm.

The "elongation rate" in the present specification means the degree of elongation, and is assumed to be performed by the following measuring method. First, if the disposable diaper is enclosed in a package or the like, the disposable diaper is taken out from the package. Secondly, a sample to be measured is prepared by cutting out an arrangement area such as an elastic sheet constituting the waist-surrounding elastic portion. The state in which such a sample is left for 24 hours in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH is referred to as a “natural state”.

Third, in such a natural state, between the end of the waist elastic part on the absorption core side (front end) and the end of the waist elastic part on the waist opening side (rear end), that is, , At the intermediate position in the front-back direction L, dots (marks) are intermittently added along the width direction W. This point is based on the center of the width direction W of the waist circumference expansion and contraction portion, and points (marks) are made from the reference to the end of the width direction W of the sample of the waist circumference expansion and contraction portion at intervals of 5 mm to the left and right of the width direction W. wear. Fourth, measure the distance between adjacent points. This distance is taken as the natural length (5 mm because it is marked at 5 mm intervals). Fifth, the distance between the marks when the wrinkles due to the elastic member are stretched from the natural state to a state where the wrinkles due to the elastic member cannot be visually confirmed on the elastic sheet is measured. Sixth, the elongation rate is calculated by the formula of the elongation rate (double) of each part = (distance between marks in the stretched state) / (distance between marks in the natural state).

Although the present invention has been described in detail using the above-described embodiments, it is clear to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as determined by the description of the scope of claims. Therefore, the description of the present specification is for the purpose of exemplary explanation and does not have any limiting meaning to the present invention.

According to the present invention, it is possible to provide a disposable diaper that can secure the fit to the crotch of the body and also the fit to the buttocks and suppress leakage.

10 Disposable diaper 10LC: Center in the front-back direction of the diaper 10WC: Center in the width direction of the diaper 21 Front sheet 22 Side sheet 23 Back sheet 24 Exterior sheet 27 Side flap part 30 Absorber 31 Absorbent core 32 Core wrap 33 Low basis weight part 41 Inseam Telescopic part 42 Leg circumference elastic part 43 Leakage-proof elastic part 45 Waist circumference elastic part 51 Indicator 71 Central high-rigidity part 72 Rear high-rigidity part 81 Decorative part 85 Deformation base point part 91 Fastening tape 92 Base part 93 Engagement part 95 Target part EL1 1st extension line EL2 2nd extension line VL1 1st virtual line VL2 2nd virtual line ML1 1st intermediate line ML2 2nd intermediate line ML3 3rd intermediate line S1 Front waist circumference area S2 Rear waist circumference area S3 Inseam area L Front-back direction T thickness Direction T1 Skin side T2 Non-skin side W Width direction

Claims (10)

In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
At least the absorption core placed in the inseam area,
A pair of inseam telescopic portions arranged on both outer sides of the center of the absorption core in the width direction and extending in the front-rear direction.
The absorption core is arranged between the wide portion having the maximum width of the absorption core and the wide portion arranged in the front-rear direction, and the length in the width direction is shorter than the maximum width of the absorption core. And is a disposable diaper with
At least a part of the inseam telescopic portion is arranged inside the narrow portion in the width direction with respect to the outer edge of the absorption core.
The rear end edge of the inseam telescopic portion is arranged on the front side of the rear end edge of the narrow portion .
It has a waist elastic portion that expands and contracts at least in the width direction in the rear waist circumference region.
The waist elastic portion is arranged in a region overlapping the absorption core on the rear side of the narrow portion and on the outer side of the inseam elastic portion in the width direction.
The waist-circling elastic portion has a first region and a second region having a higher elongation rate in the width direction than the first region.
A disposable diaper in which the first region is arranged on a first extension line extending rearward from the rear end edge of the inseam telescopic portion. The disposable diaper according to claim 1 , wherein the second region is arranged on a second extension line extending rearward from the region outside the inseam telescopic portion in the width direction. In the front-back direction and width direction that are orthogonal to each other,
The front waist area, the rear waist area, and the inseam area arranged between the front waist area and the rear waist area, and the inseam area.
At least the absorption core placed in the inseam area,
A pair of inseam telescopic portions arranged on both outer sides of the center of the absorption core in the width direction and extending in the front-rear direction.
The absorption core is arranged between the wide portion having the maximum width of the absorption core and the wide portion arranged in the front-rear direction, and the length in the width direction is shorter than the maximum width of the absorption core. And is a disposable diaper with
At least a part of the inseam telescopic portion is arranged inside the narrow portion in the width direction with respect to the outer edge of the absorption core.
The rear end edge of the inseam telescopic portion is arranged on the front side of the rear end edge of the narrow portion.
It has a fastening tape that is located in the rear girth region and has an engaging portion that engages the front girth region.
The absorption core on the rear side of the inseam expansion / contraction portion is provided with a pair of deformation base points extending toward the rear side toward the outside in the width direction and arranged at intervals in the width direction. Has been
The deformation base point portion is a disposable diaper arranged inside the second virtual line connecting the rear end edge of the inseam expansion / contraction portion and the rear end edge of the narrow portion in the width direction. The disposable diaper according to claim 3 , wherein the angle of the second virtual line with respect to the width direction is smaller than the angle of the deformation base point portion with respect to the width direction. The disposable diaper according to any one of claims 1 to 4 , wherein the front end edge of the inseam telescopic portion is arranged on the rear side of the front end edge of the narrow portion. The disposable item according to any one of claims 1 to 5 , wherein the distance between the inseam stretchable portion and the outer edge of the absorption core is 1/4 or more of the length between the outer edges of the absorption core. Diapers. It has a pair of side sheets that are located closer to the skin surface than the absorption core and cover the outer side of the absorption core.
The side sheet constitutes a pair of leak-proof gathers having a contraction portion that stands up due to the contraction of the leak-proof elastic member and a base point portion that serves as an upright fulcrum of the contraction portion outside the contraction portion in the width direction.
Claim 1 to claim 1, wherein the distance in the width direction between the apex of the contraction portion and the base point portion is longer than the distance in the width direction between the outer edge of the absorption core in the narrow portion and the inseam expansion / contraction portion. The disposable diaper according to any one of 6 . The inseam expansion / contraction portion includes a first inseam expansion / contraction portion arranged on one side with respect to the center in the width direction of the absorption core, and a second inseam expansion / contraction portion arranged on the other side with respect to the center in the width direction of the absorption core. Have,
The first inseam telescopic portion and the second inseam telescopic portion each have a plurality of elastic members arranged at intervals in the width direction.
17 . Disposable diaper according to any one item. The absorption core in the inseam region is provided with a high-rigidity portion having a higher rigidity than the surrounding region between the pair of inseam expansion / contraction portions.
The disposable diaper according to any one of claims 1 to 8 , wherein the high-rigidity portion straddles the center of the absorption core in the width direction. A fastening tape arranged in the rear waist area and having an engaging portion engaged with the front waist area, and a fastening tape.
A leg circumference expansion / contraction portion that expands / contracts in the front-rear direction outside the absorption core in the width direction is provided.
Any one of claims 1 to 9, wherein the leg circumference stretchable portion is arranged on a first virtual line connecting the front end edge of the inner edge of the engaging portion and the rear end edge of the inseam stretchable portion. Disposable diaper according to item 1.

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